Zhang Zhao, Liu Kun, Jiang Junfeng, Xu Tianhua, Wang Shuang, Ma Jinying, Chang Pengxiang, Zhang Jiahang, Liu Tiegen
School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.
Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin 300072, China.
Nanomaterials (Basel). 2020 Jul 21;10(7):1423. doi: 10.3390/nano10071423.
The sensitivity enhancement of the weakly tilted fiber Bragg grating (WTFBG) integrated with black phosphorus (BP) was investigated via numerical simulations and experimental demonstrations. BP nanosheets were deposited twice on the cylindrical WTFBG surface using the in situ layer-by-layer (i-LbL) deposition technique. The resonance intensity of the deepest cladding mode located around 1552 nm of WTFBG had a 9.2 dB decrease after the BP deposition process. This allows for the application of the intensity-modulated refractive index (RI) sensor. The sensing platform was implemented on the use of the BP integrated with WTFBG (BP-WTFBG). The refractometric sensing was achieved with the sensitivity enhancement of the resonance intensity modulation of the deepest cladding mode for the BP-WTFBG. The sensitivities were 137.6 dB/RIU and 75.6 dB/RIU in the RI region of 1.33-1.35 and 1.35-1.38, respectively. This platform shows great potential applications for biochemical sensing because of its highly sensitive RI sensing ability around the biochemical sensing window.
通过数值模拟和实验演示，研究了集成有黑磷（BP）的弱倾斜光纤布拉格光栅（WTFBG）的灵敏度增强情况。使用原位逐层（i-LbL）沉积技术在圆柱形WTFBG表面两次沉积BP纳米片。在BP沉积过程之后，位于WTFBG约1552 nm处的最深包层模式的共振强度下降了9.2 dB。这使得强度调制折射率（RI）传感器得以应用。传感平台基于集成有WTFBG的BP（BP-WTFBG）构建。通过增强BP-WTFBG最深包层模式的共振强度调制灵敏度实现了折射传感。在1.33 - 1.35和1.35 - 1.38的RI区域，灵敏度分别为137.6 dB/RIU和75.6 dB/RIU。由于该平台在生化传感窗口附近具有高灵敏度的RI传感能力，因此在生化传感方面显示出巨大的潜在应用价值。
